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<pre>
sudo systemctl stop earlyoom
sudo systemctl stop earlyoom
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* So as not to trigger the memory pressure policy for systemd-oomd, create an override with the following commands (don't forget to remove this file and `systemctl daemon-reload` to restore the settings afterwards):
<pre>
sudo mkdir /etc/systemd/system/user@.service.d/
printf "[Service]\nManagedOOMMemoryPressure=auto" | sudo tee /etc/systemd/system/user@.service.d/99-test.conf
sudo systemctl daemon-reload
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systemd-run --user -r --unit systoomd_swap_test tail /dev/zero
systemd-run --user -r --unit systoomd_swap_test tail /dev/zero
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* Make sure to clean up the override and reset the test unit after verifying the results:
* Make sure to reset the test unit after verifying the results:
<pre>
<pre>
sudo rm /etc/systemd/system/user@.service.d/99-test.conf
sudo systemctl daemon-reload
systemctl --user reset-failed systoomd_swap_test.service
systemctl --user reset-failed systoomd_swap_test.service
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</pre>

Revision as of 09:53, 18 March 2021

Description

This test case tests that systemd-oomd kills the largest swap consumer when swap used is greater 90% (or whatever limit was defined by systemd-oomd-defaults).

Setup

  • This test case should be performed on either bare-metal or virtual machines.
  • Check that you are running systemd 248~rc1 or higher with systemctl --version.
  • Ensure the systemd-oomd-defaults package is installed (included with Fedora 34).
  • Boot the system and log in as a regular user.
  • Ensure no other conflicting userspace OOM killers are running. For example you may have to stop earlyoom:
sudo systemctl stop earlyoom

How to test

  • Check that systemd-oomd is running:
systemctl status systemd-oomd
  • Check that the systemd-oomd-defaults policy was applied by running oomctl and verifying that "/" is listed as a path under "Swap Monitored CGroups" along with the current swap usage.
  • Now run the test:
systemd-run --user -r --unit systoomd_swap_test tail /dev/zero
  • Make sure to reset the test unit after verifying the results:
systemctl --user reset-failed systoomd_swap_test.service

Expected Results

  • systemd-oomd will have killed the unit started above.
  • You can verify by checking for some of the relevant log lines with journalctl: "Swap used <...> is more than 90%" or "systemd-oomd killed <...> process(es)"
  • The output of systemctl --user status systoomd_swap_test should say the unit is killed (with no mention of oom-kill).
  • Swap used should be below 90% (use free -h)



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